Kontakt 6 or Kontakt 7
All the Mix-Ready templates will run with the latest version of Kontakt 6. (Which is 6.7.1 as of February 2023)
Native Access rolled out Kontakt 7 in 2022 but they missed to make it downwards compatible. So you can't open Kontakt 6 presets and projects with Kontakt 7.
Luckily, you can install Kontakt 6 just fine and even use it next to Kontakt 7 with no issues.
Kontakt 6 - Installation
Please open Native Access and go to Preferences - Legacy Products. Now enable Show discontinued products and you will be able to install Kontakt 6. Here's a screenshot.
How to find Kontakt 6 in the DAW
1.) Open Native Access and check for updates. You can also view the current version and installation path of Kontakt 6. Here's a screenshot.
2.) Make sure that your DAW scans this exact installation path - and finds the correct Kontakt.dll
Sometimes after updating Kontakt 6, the DAW will continue to open the old version of Kontakt, because the old Kontakt.dll is still somewhere on the system. Please delete any old Kontakt.dll files that you don't need anymore.
If all this didn't work for you or you are still looking for more information, feel free to send an e-mail to firstname.lastname@example.org and I'll get back to you as soon as possible.